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In Wikipedia there is a page on hybrid cryptosystems. However, although cryptography contains a lot more than just encryption, only hybrid encryption using key encapsulation and data encapsulation is discussed.

So my simple question is: should I consider a signature scheme using a hash a hybrid cryptosystem? Or is the term not that well defined and is it up to the entity that uses the term?

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  • $\begingroup$ Isn't the word cryptosystem only used for encryption? $\endgroup$ – CodesInChaos Jan 11 '18 at 0:01
  • $\begingroup$ Hmm, it is according to Wikipedia. Must be something from the olden days maybe. I was thinking that it is just several algorithm tossed together to create any kind of system. Could be the answer... $\endgroup$ – Maarten Bodewes Jan 11 '18 at 0:04
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What I didn't directly see is that a hybrid cryptosystem is not the same thing as hybrid cryptography. A cryptosystem is commonly targeting encryption: it exists of a key generation function $\operatorname{Gen}$, an encryption function $\operatorname{Enc}$ of course a decryption function $\operatorname{Dec}$.

So although signature generation could probably be called hybrid cryptography, it commonly isn't a hybrid cryptosystem because it lacks the $\operatorname{Enc}$ and $\operatorname{Dec}$ function.

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  • $\begingroup$ It wouldn't hurt to be careful when using these terms though, some clarification is probably in order. $\endgroup$ – Maarten Bodewes Jan 12 '18 at 2:19

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